Telephone silencer



. 1,642,5'43 L. J. GAMoTY TELEPHONE SILENCER Sept. 13, 1927.

Filed Sept. 25. 1926 LuclEN J'osaPH GAP/fryV yl N V E' NTO Rg Patented Slept. `13, 1927.

L'UNITED ,STATES 1,642,543 PATENT OFFICE.

LUCIEN JOSEPH GAMOTY, OF BONDI, NEARSYDNEY, NEW SOUTH WALES, AUSTRALIA,

ASSIGNOR l TO SECROPHONES LIMTED, OF, SYDNEY, NEW SOUTH WALES, AUS- TRALIA, A COMPANY OF NEW SOUTH WALES.

V'IELEKEHONE SILENCER.

Applicationled September 23, 1926, Serial No. 137,248, and in'Australa November 25, 1925.

This invention relates to appara-tus of the sound deadener or suppresser type adapted tobe attached to the mouthpieces of transmitters rif-telephones and whereby sound to be transmittedthrough such mouthpieces over a line or otherwise though not impaired in transmission is not capable of being heard by persons located in the vicinity of such mouthpieces, so that conversation can be carried on'by users oftelephones and sound waves thus produced can be transmit-ted privately.

The said apparatus consists of a hollow casing preferably constructed of metal l5 though it maybe constructed of other suitable material. Such casing may be of any appropriate pattern; it preferably is furnished with two hollow end wings through which air, or gases breathed by a person, are

free to circulate.

In the front wall of the casing is an opening with which the lips of a person may be closely associated whilst conversation is being carried on into the mouthpiece of the telephone transmitter. The casing is adapted to be fitted onto the said mouthpieces.

lVithin the said wings may be arranged a series of plates which are disposed therein in spaced relation to each other. When the plat-es are fitted in the wings openings in the separate plates are in staggered relation with each other, so that sound waves impressed into the casing are caused to take a circuitous path, and in so doing such waves are not resounded outwardly of the casing, consequently persons in the vicinity of the telephone can not hear conversation which is being carried on.

Referring to the accompanying drawings in which embodiments of the invention are illustrated, Fig. 1 is a perspective view of the apparatus showing the mouthpiece opening at one side thereof; Fig. 2 a broken perspective view of the apparatus showing the side thereof which is connectable to a telephone mouthpiece; Fig. 3 is a section on plane 3 3, Fig. 1; Fig. t is a section on plane lr-4, Fig. 1; and Fig. 5 a broken sectional view showing modified construction of wing plates.

A hollow casing 1 of suitable design or pattern is provided; such casing may be of metal or other suitable material. At one Side the casing 1 is furnished with an approlbreatlung of such person.

priate mouthpiece opening '2 adapted to lconnected to the transmitter mouthpieces t of 'a telephone by means of the adjustable screws The interior of the ange 3 5 or otherwise. g

may `carry a packing washer 17 of rubber orA other 4.suitable material. The opening 18 is opposite to the opening 2 in the casing 1, so

that atlirough opening is provided in the casing 1, in relation to the telephone mouthpiece 4.

Fitted to vthe casing 1 in anydesired manner are oppositely disposed hollow end wings 6 and 7. The interior of such wings may be grooved as at 8 to receive the plates 9 which are spaced from each other. Each of said plates 9 has a series of openings 10 therein. In the drawings the wings 6 and 7 are shown open ended and are of conical shape. Any suitable means may be utilized'for securing the plates 9 in the wings 6 and 7 these means may consist of a through screw-rod 11 and tightening nuts 12 with thumb-nut 13. The rods 11 pass through the whole of the plates 9 and their inner ends engage tapped openings respectively in the end walls 14 of the casing 1. In such end walls are the openings 15. llhen the whole of the plates 9 are assembled in the wings 6 and 7 respectively the openings 10 in such plates 9 and in the end walls respectively will be in staggered relation, so that any sound waves transmitted to the casing 1 through a person speaking thereinto will be vcaused to take a circuitous path through the openings 15 and 10 before they will be emitted through the openings 10 in the outer plates 9 of the wings 6 and 7. Atmospheric air is, however, free to enter the casing 1 through the openings 10 and 15 and gases breathed into the casing 1 by a person speaking thereinto are also free to pass to atmosphere through said openings.

Instead of constructing the series of wing plates 9 to flat disc formation they may be formed with pockets 16 (Fig. 5) whereby` sound wav-es upon passing throu 'h either the openings 15 or lOwill be cause to enter Q I I f 1,642,543

l said pockets and have to pass about the side Walls of such pockets in seriatim before such Waves Will be able to complete the circuit of staggered openings and l5.

As the apparatus is fitted with means hear the conversation Which is being' carried on, so long as the person using the telephone speaks directly into the casing l With the mouth in close association With the speaker opening 2r of the said casing.

ff rlhough the emission of Clear sound from the casing l and Wings 6 and 7 is prevented free transmission of sound Waves is allowed through the apparatus.

What I claim as my invention. and desire to secure by Letters latent is l. `A telephone silencer comprising a hol- 10W casing having a through opening in one direction leading to the telephone mouthpiece and perforated end Walls disposed in the opposite direction, tapered cylindrical members arranged over each end Wall, and a series of spaced discs of increasing diameter held Within the tapered cylindrical members, each disc having perforations in staggered' relation to the perforations of adjacent discs to provide a circuitous path for the sound Waves lseeking exit therethrough.

2. A telephone silencer as claimed in claim l, in which the interior Wall of each tapered cylindrical member is steppedV to accommodate the peripheral portion of the discs, and

meansr for holding the discs seated in said;

steps.

A telephone silencer, as claimed in claim l, in which the discs comprise fiat plates having concentric perpendicular Walls projecting from their surfaces toward the adja.

cent discs of decreasing diameter.

ture.

1LUoiEN JOSEPH eA-MoTY.

In testimony whereof I yaffix my signa-l 

